Run the Fabric Installer jar you downloaded, select the Server tab and select the Minecraft Version you want.
NOTE
You need to click show snapshots if you want it to also show fabric for minecraft snapshots.
Click install, this will download a fabric-server-launch.jar, it will also show you a button for Download server jar, press that one too.
You can now close the fabric launcher, you should have a fabric-server-launch.jar and a server.jar file.
Upload those files to the root of your Godlike server.
Go to the Startup tab of the Godlike Panel and set Server Jar File to fabric-server-launch.jar
Restart your server and let the files generate. This may take a few minutes.
You are now done, you are running a fabric server!
It's a server without mods though, so it's still purely vanilla at this point, keep reading to learn how to install mods.